// Login Component - ES6 Module
const { reactive, ref } = Vue
const { ElMessage } = ElementPlus

export default {
  name: 'Login',
  setup() {
    const loginFormRef = ref()
    const loading = ref(false)
    
    const loginForm = reactive({
      username: 'admin',
      password: '123456'
    })
    
    const rules = reactive({
      username: [
        { required: true, message: '请输入用户名', trigger: 'blur' },
        { min: 3, max: 20, message: '用户名长度在 3 到 20 个字符', trigger: 'blur' }
      ],
      password: [
        { required: true, message: '请输入密码', trigger: 'blur' },
        { min: 6, max: 20, message: '密码长度在 6 到 20 个字符', trigger: 'blur' }
      ]
    })
    
    // API function
    const login = (data) => {
      return axios.post('/auth/login', data)
    }
    
    const handleLogin = async () => {
      if (!loginFormRef.value) return
      
      await loginFormRef.value.validate(async (valid) => {
        if (valid) {
          loading.value = true
          try {
            const response = await login(loginForm)
            if (response.data.code === 200) {
              localStorage.setItem('token', response.data.data.token)
              localStorage.setItem('userInfo', JSON.stringify(response.data.data.userInfo))
              ElMessage.success('登录成功')
              // Use router from global context
              window.location.hash = '#/home'
            } else {
              ElMessage.error(response.data.message || '登录失败')
            }
          } catch (error) {
            console.error('Login error:', error)
            ElMessage.error('登录失败，请检查网络连接')
          } finally {
            loading.value = false
          }
        }
      })
    }
    
    return {
      loginForm,
      rules,
      loginFormRef,
      loading,
      handleLogin
    }
  },
  template: `
    <div class="login-container">
      <el-card class="login-card">
        <template #header>
          <h2 class="login-title">用户登录</h2>
        </template>
        
        <el-form
          :model="loginForm"
          :rules="rules"
          ref="loginFormRef"
          label-width="80px"
          class="login-form"
        >
          <el-form-item label="用户名" prop="username">
            <el-input
              v-model="loginForm.username"
              placeholder="请输入用户名"
              prefix-icon="User"
            />
          </el-form-item>
          
          <el-form-item label="密码" prop="password">
            <el-input
              v-model="loginForm.password"
              type="password"
              placeholder="请输入密码"
              prefix-icon="Lock"
              show-password
            />
          </el-form-item>
          
          <el-form-item>
            <el-button
              type="primary"
              @click="handleLogin"
              :loading="loading"
              class="login-btn"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-card>
    </div>
  `
}

// Add styles
if (!document.querySelector('#login-styles')) {
  const styleElement = document.createElement('style')
  styleElement.id = 'login-styles'
  styleElement.textContent = `
    .login-container {
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }

    .login-card {
      width: 400px;
      box-shadow: 0 15px 35px rgba(50, 50, 93, 0.1), 0 5px 15px rgba(0, 0, 0, 0.07);
    }

    .login-title {
      text-align: center;
      margin: 0;
      color: #333;
    }

    .login-form {
      padding: 0 20px;
    }

    .login-btn {
      width: 100%;
    }
  `
  document.head.appendChild(styleElement)
}